1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <sys/statvfs.h> 18 19 #include <sys/statfs.h> 20 21 // Paper over the fact that 32-bit kernels use fstatfs64/statfs64 with an extra argument, 22 // but 64-bit kernels don't have the "64" bit suffix or the extra size_t argument. 23 #if __LP64__ 24 extern "C" int __fstatfs(int, struct statfs*); 25 extern "C" int __statfs(const char*, struct statfs*); 26 # define __fstatfs64(fd,size,buf) __fstatfs(fd,buf) 27 # define __statfs64(path,size,buf) __statfs(path,buf) 28 #else 29 extern "C" int __fstatfs64(int, size_t, struct statfs*); 30 extern "C" int __statfs64(const char*, size_t, struct statfs*); 31 #endif 32 33 // The kernel sets a private ST_VALID flag to signal to the C library whether the 34 // f_flags field is valid. This flag should not be exposed to users of the C library. 35 #define ST_VALID 0x0020 36 37 static void __statfs_to_statvfs(const struct statfs& in, struct statvfs* out) { 38 out->f_bsize = in.f_bsize; 39 out->f_frsize = in.f_frsize; 40 out->f_blocks = in.f_blocks; 41 out->f_bfree = in.f_bfree; 42 out->f_bavail = in.f_bavail; 43 out->f_files = in.f_files; 44 out->f_ffree = in.f_ffree; 45 out->f_favail = in.f_ffree; 46 out->f_fsid = in.f_fsid.__val[0] | (static_cast<uint64_t>(in.f_fsid.__val[1]) << 32); 47 out->f_flag = in.f_flags; 48 out->f_namemax = in.f_namelen; 49 } 50 51 int fstatfs(int fd, struct statfs* result) { 52 int rc = __fstatfs64(fd, sizeof(*result), result); 53 if (rc != 0) { 54 return rc; 55 } 56 result->f_flags &= ~ST_VALID; 57 return 0; 58 } 59 __strong_alias(fstatfs64, fstatfs); 60 61 int statfs(const char* path, struct statfs* result) { 62 int rc = __statfs64(path, sizeof(*result), result); 63 if (rc != 0) { 64 return rc; 65 } 66 result->f_flags &= ~ST_VALID; 67 return 0; 68 } 69 __strong_alias(statfs64, statfs); 70 71 int statvfs(const char* path, struct statvfs* result) { 72 struct statfs tmp; 73 int rc = statfs(path, &tmp); 74 if (rc != 0) { 75 return rc; 76 } 77 __statfs_to_statvfs(tmp, result); 78 return 0; 79 } 80 __strong_alias(statvfs64, statvfs); 81 82 int fstatvfs(int fd, struct statvfs* result) { 83 struct statfs tmp; 84 int rc = fstatfs(fd, &tmp); 85 if (rc != 0) { 86 return rc; 87 } 88 __statfs_to_statvfs(tmp, result); 89 return 0; 90 } 91 __strong_alias(fstatvfs64, fstatvfs); 92
